Spring Temperature Exceedance Analysis

Using delta temperature data we examined the frequency of temperatures in March and April being >= 15°C and >= 17°C respectively for two strata (Yolo Bypass and Sacramento River). We used water year type data from WaterYearType and filtered to include only location == "Sacramento Valley".

We first summarized the data to daily averages and then calculated the following:

The summarized data is saved in cache_slough_temp_exceeding_tresholds_long.csv.

March Temp Exceedance

March Proportion Temp Exceedance of Threshold by Water Year Type I calculated the mean proportion above threshold for each water year type by grouping by water_year_type and then calculating the mean of the prop_above_threshold column.

Water Year Type Mean Prop Above Threshold
Critical 0.3514310
Dry 0.2427273
Below Normal 0.1211111
Above Normal 0.0666667
Wet 0.0645833

Figures

April Temp Exceedance

April Proportion Temp Exceedance of Threshold by Water Year Type

Water Year Type Mean Prop Above Threshold
Critical 0.5272894
Dry 0.3085017
Below Normal 0.3230159
Above Normal 0.0000000
Wet 0.1799479

Figures